Reducing Noise of a 3COM 3CBLSG48 Baseline Switch (2948-SFP Plus)

Posted on 2009-12-18
Last Modified: 2013-11-10
I got a great deal on a 3COM 3CBLSG48 Baseline Switch (2948-SFP Plus), but am amazed at the amount of noise that it generates. Is it possible reduce the noise by replacing with a better fan or by shielding it from the rest of the room. This will be in an office environment that already has lots of computers and servers running (temperature is 65-75F most times), but the increased amount of noise that this brought to the room was astounding. "What?" seems to be the most used phrase now.
Question by:frtools
    LVL 34

    Expert Comment

    by:Istvan Kalmar

    It is not possible if you bought it with guarantee, if it hasn't you able to change the ventilators to lower noise, I advise PAPST

    Best regards,
    LVL 21

    Expert Comment

    We had a noisy switch like that in an office environment and someone just covered it with a cardboard box a little bigger than the switch itself. This one never overheated and was much quieter but I would recommend watching the overtemp sensor via SNMP just to be sure. Also if you can, try putting it under a desk or table to give you a little more isolation.
    LVL 26

    Expert Comment

    If the unit runs hot enough to need fan[s] don't be covering vents.

    Small high flow fans make lots of noise. [Not really any way around that.]
    A lower flow fan is apt to cause overheating problems.

    You either need to rework the chassis to accommodate a larger diameter lower RPM fan that moves the same [or more] air and delete the small loud fan -or- mount it as-is in a larger outer chassis [stripped 4U or tower case might work] that has it's own larger diameter lower RPM fan [this will muffle the noisy fan inside the outer case.].

    This would be a good 'special project' for someone handy with tools and not afraid of sheet metal.

    LVL 26

    Accepted Solution

    If it's rack-mounted I think I would pull the top cover and work it into a 3U or 4U with fans just leaving the cover off inside the bigger chassis.
    You could run the fans in the 3U/4U with an appropriate wall-wart and simply disconnect the loud fan[s].
    LVL 32

    Assisted Solution

    Isolation is the only method that would not upset your local fire marshal or insurance company.

    If you can't get it into another room, perhaps the money you saved could pay for a sound dampened rack/cabinet:

    Range from 4u@$600 to 25u@$2500.

    There are others from furniture companies and other rack makers, but this one is "pretty".  And no MDF or laminate with fake woodgrain.

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